What I would really like to find right now is a frostspear. That weapon is holding me in a sidequest and I can't think of where I could find one. I've gone back to some winter zones but none of the enemies seem to have them when I was there.
Also, has anyone been experiencing a glitch with the Blood Moon? When I was playing yesterday, after I left Hyrule Castle I had a Blood Moon right away which I expected because of how long I was exploring the castle and I don't think they can occur while in that zone. However, a bit later in my play session, I got another Blood Moon except it was in the afternoon! I was confused at first because it seemed pretty soon but then it hit me that it was daylight after it was over and looking at my ingame world clock it said it was 2:40 PM. I just chalked it up to me being in Hyrule Castle too long and the game working out its Blood Moon schedule.
In regards to the Frostspear- there's a reason the Coliseum is a really great place for Major Tests of Strength and for completing that particular sidequest, but it might not be available to you right now. Like I said, the weapons that enemies hold, as well as enemies themselves, become better as you complete more Shrines.
I have had some ridiculous Blood Moon shenanigans happen during my playthrough. They say that the more unique monsters you kill (Guardians, Taluses, Hinoxes, Lynels) the more likely it is that a Blood Moon will rise, however, during the lightning trial by Rito village, I had a Blood Moon rise twice within the span of 12 hours, resetting the incomplete elements of the trial because that's how Blood Moons work- they reset any animals, enemies, and interactive elements that haven't been locked into place by a mechanism. While the glitching out of models hasn't occurred, I think the resetting of elements might have something to do with that. I've also had two blood moons occur in the same night, within the span of four hours, if you can believe it.